(3 5 add) 3 5 add pstack clear
(99 3 idiv) 99 3 idiv pstack clear
(99 5 mod) 99 5 mod pstack clear
(3 10 mul) 3 10 mul pstack clear
(8 20 sub) 8 20 sub pstack clear
(-3 neg)  -3 neg pstack clear
(3 neg)    3 neg pstack clear
(-3 abs)  -3 abs pstack clear
(3 abs)    3 abs pstack clear
